Dross-furnace.



G. L. WALKER.

DROSS FURNACE.

APPLICATION FILED 0012. 1909.

949,31 1 Patented Feb. 15, 1910.

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GEORGE LESLIE WALKER, OF PUEBLO, COLORADO, ASSIGNOR TO PARAGON METALS COMPANY, OF NEW YORK, N. Y.. A CORPORATION OF NEW YORK.

DROSS-FURNACE.

Specification of Letters Patent.

Patent-ed Feb. 15, 1910.

Application filed October 2, 1909. Serial No. 520,747.

T 0 all whom it may concern:

Be it known that 1 Gnonen Lnsmn l/VALKER, a citizen of the United States, residing at Pueblo, in the county of Pueblo and State of Colorado, have invented a new and useful Improvement in Dress-Furnaces, of which the following is a specification.

My invention relates to improvements in dross furnaces in which a conical caldron is inclosed within the walls of the furnace, in which heat is produced by either coal, or gas, and in such manner that the caldron may be revolved on its ends which are formed to serve as trunnions; and the ob jects of my improvement are, first, to provide a dross furnace for melting dross of type metals, and, second, to provide a dross furnace that will require little space in which to operate the same, and that will utilize the heat in an economical manner; and, third, to provide a means of melting dross to metal, that will prevent the dross from coming in contact with the open air and thereby reduce the production of litharge to a minimum.

I attain these objects by means of the mechanism illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation, in partial cross-section, of my dross furnace set up for operation. F 2 is a perspective view of a corrugated stopper to hold the dross from passing out of the small end of the conical caldron. Fig. 3 is a front elevation of the conical caldron showing thereon a wrench employed to revolve the same. Fig. 4 is a plan view of the top of the dross furnace, with all parts in place.

Similar numerals refer to similar parts throughout theseveral views.

The furnace walls are formed of a suitable piece of sheet metal 22 in such manner that the walls are equidistant from the sides of the conical caldron and with suitable openings for the trunnion bearings 5 and 6 of the caldron and for the doors 21 and 23. A casting 27, carrying doors 21 and 23, is secured to one side of the furnace, and a bracket 20 is secured to the front end of the furnace to carry mold 19, into which the molten metal flows from the conical caldron. The furnace contains an ordinary grate 29, which is held up in place by clips 30, that are secured to the interior of the furnace walls in suitable manner. The base 2 1, on which the furnace stands and is held up from the floor, is provided with small to the furnace, opposite each other and carry the trunnion ends of the conical caldron. A collar 8 is formed on trunnion 7 to prevent the caldron from slipping forward when being revolved by wrench 26 on the squared end 25 of the caldron. The hood, or top of the furnace, is secured to bearing castings 5 and (5, which are divided at 12 and 13 so that the hood may be raised to remove the conical caldron, and is provided with a door 15 through which fuel may be applied to fill the same up well around the caldron to produce intense heat around it. An ample d 'aft pipe 16 is applied to the hood and is connected to any suitable chimney for draft.

By the form of furnace described above, it will be seen that the caldron is kept within the heated interior without being exposed to the open air, and that it may be revolved at will by means of wrench 26. In the conial caldron 1, the dross 17 is shovcled through trunnion 7 and is prevented from passing out at the other end of the caldron by the conical stopper 2, which is held tightly in the interior of the caldron by bolt 3 which passes to the outside of the caldron through the small end and engages a cross washer 4 in such manner that the stopper may be held securely and the molten metal may flow out through corrugations 1 1: of the stopper and the openings in washer 4-. Trnnnion 7 is PLOVlClQCl with a hinged door 9, having a peep hole 11, in which is secured a mica disk 10 through which the operator may look to see the condition of the dross. Several holes 31 are drilled through trunnion 7 at points within the furnace so that gases raising from the dross may escape and be burned without esca nng to the outside. Door 9 may be opened to refill the caldron, or to stir the dross so that the melted portion will settle to the bottom where it will run out into the mold 19.

lt may be seen, from the foregoing, that the mechanism illustrated and described forms a furnace for melting dross to metal caldron were open and air were allowed to come in contact with the dross.

The form of the conical caldron has a further advantage that it may be revolved so as to agitate the dross and cause the shotlike particles of molten metal that hang in the dross to settle to the bottom, where they will run together and form a body and then run out of the caldron, the bottom of which is so placed that its lowest point is the small end of the caldron. The dross may be agitated by introducing a rake through the trunnion 7 and raking it, and the caldron revolved only when the then lowest portion has become bulged from heat and a new portion is required to be turned under the dross.

I am aware that dross furnaces have been made that permit the molten metal to flow out from under the dross. I, therefore, do not claim such broadly, but

What I do claim as my invention and desire to secure by Letters Patent is:

1. In a dross furnace, a conical caldron having trunnion ends, vent holes, a hinged door on one of the trunnion ends and squared portion on the other'trunnion end, substantially as described.

2. In a dross furnace, a conical caldron suspended on its opposite ends Within the furnace in such manner that its smaller end is lower than any other part of the caldron, substantially as shown and described.

3. In a dross furnace, a conical caldron suspended on its opposite ends within a furnace, and vent holes, hinged door, and squared portion on one of the trunnion ends,

a furnace composed of an upper removable hood portion and a lower portion standing 011 a base having small legs, that so conforms to the said conical caldron as to be equidistant from its sides, substantially as de scribed.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE LESLIE YVJ'ILKER.

Vitnesses F. M. I-IARMER, D. LOOKARD. 

